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81C55 Datasheet(PDF) 11 Page - OKI electronic componets |
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81C55 Datasheet(HTML) 11 Page - OKI electronic componets |
11 / 19 page 11/19 ¡ Semiconductor MSM81C55-5RS/GS/JS (1) Programming the Command/Status (C/S) Register The contents of the command register can be written during an I/O cycle by addressing it with an I/O address of xxxxx000. Bit assignments for the register are shown below: TM2 TM1 IEB IEA PC2 PC1 PB PA Definition of PA0 - 7 0= Input Definition of PB0 - 7 1= Output Definition of PC0 - 5 00=ALT1 11=ALT2 01=ALT3 10=ALT4 See the port control assignment table. Port A Interrupt Enable 1 = Enabled Port B Interrupt Enable 0 = Disabled Timer Command 00 = NOP : Does not affect counter operations. 01 = STOP : Stops the timer if it is runnning. NOP if the timer is not runnning. 10 = STOP AFTER TC : Stops the timer when it reaches TC. NOP if the timer is not running. 11 = START : If the timer is not running, loads the mode and the count length, and immediately starts timer operation. If the timer is running, loads a new mode and the count length, and starts timer operation immediately after TC is reached. 76543210 Pin PC0 PC1 PC2 PC3 PC4 PC5 ALT1 Input port Input port Input port Input port Input port Input port ALT2 Output port Output port Output port Output port Output port Output port ALT3 A INTR A BF A STB Output port Output port Output port ALT4 A INTR A BF A STB B INTR B BF B STB Port Control Assignment Table |
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